System: Powertrain (P-Code)
SAE Standard (Generic)
Family: Torque Converter Clutch Circuit
Code P0743: Torque Converter Clutch Circuit Electrical
Diagnostic & Technical Explanation
Code P0743 (Torque Converter Clutch Circuit Electrical) sets when the TCM detects an open circuit, out-of-range current, or a stuck-on/stuck-off performance fault while driving the torque converter clutch solenoid that locks the converter for fuel economy at cruise. Causes are a failed TCC solenoid, contaminated fluid causing the solenoid or clutch plate to stick, or damaged control wiring.
First-listed procedure
Rank #1
Verify transmission fluid level before TCC diagnosis
Easy DIY
This is the first procedure in the authored
consideration order, not a measured cause likelihood. Execute it only when its prerequisites
and diagnostic findings support it. Its cost and labor estimates (where known), the step-by-step procedure and the
remaining 3 procedure(s) are in the licensed dataset. Ordering context.
Full family: Torque Converter Clutch Circuit
What this page does not show
This page publishes the fault mechanism and the code index. The licensed dataset adds, for
every one of the 15,886 codes, the full authored repair set (56,729 procedures in total)
with the fields deliberately withheld here:
- Procedures 2..n after the first-listed procedure
- Aftermarket parts cost ranges in USD (
est_parts_cost_min/max_usd)
- Professional labor-hour estimates (
est_labor_hours)
- Step-by-step diagnostic and repair instructions
- Replacement-part mappings and catalog lookups
- 6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)